I’m going to let you in on a secret about PuGs.
PUG requirements aren’t actually about PUGs thinking you need X to do Y. They’re about filtering out the bottom % of players who wouldn’t have those requirements.
If they require 600ilvl for normal or whatever, it’s not because they believe you need at least that amount of gear to clear. It’s because they believe that anyone who is below 600 ilvl probably won’t be a net contribution to the raid.